Queue в multiprocessing.dummy - Python

from multiprocessing.dummy import Queue, Process
from selenium import webdriver
 
def visiter(url):
    task = url.get() #берем ссылку из очереди
    print('Задача:', task)
    driver = webdriver.PhantomJS(executable_path=r'C:\phantomjs-2.1.1-windows\bin\phantomjs.exe')
    myurl = driver.get(task) #подставляем ссылку
    print(myurl.page_source) #на этом этапе выбивает ошибку, приведенную ниже
    task.task_done()
    driver.quit()
    print('Задача завершена!')
 
my_tk = ['http://www.python.org',
    'http://www.python.org/about/',
    'http://www.onlamp.com/pub/a/python/2003/04/17/metaclasses.html',
    'http://www.python.org/doc/',
        ]
 
urls = Queue()
 
for i in my_tk:
    urls.put(i)
 
for i in range(2):
    p = Process(target=visiter, args=(urls,))
    p.start()

Exception in thread Thread-2:
Traceback (most recent call last):
  File "C:\Users\Глеб\AppData\Local\Programs\Python\Python35\lib\threading.py", line 914, in _bootstrap_inner
    self.run()
  File "C:\Users\Глеб\AppData\Local\Programs\Python\Python35\lib\threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\Глеб\Desktop\Python\multiprocessing____dummy(test queue).py", line 9, in visiter
    print(myurl.page_source)
AttributeError: 'NoneType' object has no attribute 'page_source'
 
Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Users\Глеб\AppData\Local\Programs\Python\Python35\lib\threading.py", line 914, in _bootstrap_inner
    self.run()
  File "C:\Users\Глеб\AppData\Local\Programs\Python\Python35\lib\threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\Глеб\Desktop\Python\multiprocessing____dummy(test queue).py", line 9, in visiter
    print(myurl.page_source)
AttributeError: 'NoneType' object has no attribute 'page_source'